DjangoのテンプレートでstaticディレクトリのCSSが適用されない

Question

DjangoでWebアプリを開発しているのですが、staticディレクトリにあるCSSファイルが適用されません。urlから直接ファイルにアクセスするとちゃんとCSSのコードが表示されます。また、同様にstaticにある画像はちゃんと読み込まれます。原因がわかる方、いらっしゃいますでしょうか。

ディレクトリ階層

.
├── SFL
│   ├── init.py
│   ├── pycache(以下略)
│   ├── asgi.py
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
├── accounts
│   ├── init.py
│   ├── pycache(以下略)
│   ├── admin.py
│   ├── apps.py
│   ├── migrations(以下略)
│   ├── models.py
│   ├── tests.py
│   ├── urls.py
│   └── views.py
├── manage.py
├── media
│   └── dora.png
├── post
│   ├── init.py
│   ├── pycache(以下略)
│   ├── admin.py
│   ├── apps.py
│   ├── forms.py
│   ├── migrations(以下略)
│   ├── models.py
│   ├── tests.py
│   ├── urls.py
│   └── views.py
├── static
│   ├── accounts
│   │   └── top_page.css**(問題のCSS)**
│   └── images
│   ├── dictionary.jpg
│   ├── read.jpg
│   ├── service-header.jpg
│   ├── talk.jpg
│   ├── user_icon.png
│   └── write.jpg
└── templates
| ├── accounts
| │   ├── top_page.html**(問題のhtml)**
| │   └── user_profile.html
| ├── base.html
| └── post
| ├── post_compose.html
| └── post_list.html

関係ありそうなコード

static/settings.py

"""
Django settings for SFL project.

Generated by 'django-admin startproject' using Django 3.2.5.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""

from pathlib import Path
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-&t%!m8o8!*j6!v=9lbi)z)g72bjvw1-au+&6vn-#1&@k^u!@h)'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'post.apps.PostConfig',
    'accounts.apps.AccountsConfig',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'SFL.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'SFL.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'django_boards',
        'USER': 'lukas',
        'PASSWORD': 'newpassword',
        'HOST': 'localhost',
        'PORT': 5432,
    }
}


# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = 'ja'

TIME_ZONE = 'Asia/Tokyo'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [
  os.path.join(BASE_DIR, 'static')
]

# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

AUTH_USER_MODEL = 'accounts.User'

MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media')

問題のtemplete html

{% extends 'base.html' %}
{% load static %}

{% block link %}
<link rel="stylesheet" href="https://unpkg.com/ress/dist/ress.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Caveat:wght@700&display=swap">
<link rel="stylesheet" href="{% static 'accounts/top_page.css' %}">
{% endblock link %}

{% block content %}
    <header>
      <div class="page-header wrapper">
        <h1 class="header-logo">SFL</h1>
        <nav>
          <ul class="header-nav">
            <li><a href="">ログイン</a></li>
            <li><a href="">新規登録</a></li>
          </ul>
        </nav>
      </div>
    </header>

    <div class="top-content">
      <div class="service-header-img">
        <div class="service-header wrapper">
          <h2>Study with Foreign Languages!</h2>
          <div>SFLは異国語を使って色々な教科の勉強ができるサービスです。</div>
        </div>
      </div>

      <div class="service-detail wrapper">
        <div class="service">
          <img src="{% static 'images/write.jpg' %}">
          <h3>Write</h3>
          <p>学ぶ内容を投稿することで世界中の人に見てもらう</p>
        </div>
        <div class="service">
          <img src="{% static 'images/read.jpg' %}">
          <h3>Read</h3>
          <p>世界中の人の投稿から学ぶ</p>
        </div>
        <div class="service">
          <img src="{% static 'images/talk.jpg' %}">
          <h3>Talk</h3>
          <p>世界中の人と議論を交わす</p>
        </div>
        <div class="service">
          <img src="{% static 'images/talk.jpg' %}">
          <h3>Search</h3>
          <p>専門用語に特化した辞書機能を開発中</p>
        </div>
      </div>

    </div>
    
    <footer>
      <div class="wrapper">
        <p><small>&copy; 2021 Lukas</small></p>
      </div>
    </footer>

{% endblock content %}

###問題のCSS

@charset "UTF-8";
html {
  font-size: 100%;
}

body {
  font-family: "Yu Gothic Medium", "游ゴシック Medium", "YuGothic", "游ゴシック体", "ヒラギノ角ゴ Pro W3", "sans-serif";
  line-height: 1.7;
  color: #001279;
}

a {
  text-decoration: none;
}

.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 4%;
}

header {
  background-color: #00fff2;
}

.page-header {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}

.header-logo {
  font-size: 50px;
}

.header-nav {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  font-size: 1.25rem;
  margin: 35px 0;
  list-style: none;
}

.header-nav li {
  margin-left: 36px;
}

.header-nav a:hover {
  color: #50c5fc;
}

.service-header {
  color: #fff;
  text-align: center;
  height: 600px;
}

.service-header h2 {
  font-size: 100px;
  padding-top: 100px;
  font-family: 'Caveat', cursive;
  text-shadow: 2px 2px 10px #229cff, -2px 2px 10px #229cff, 2px -2px 10px #229cff, -2px -2px 10px #229cff;
}

.service-header div {
  padding-top: 100px;
  font-size: 1.5rem;
  color: #001279;
}

.service-header-img {
  background-image: -webkit-gradient(linear, left top, left bottom, from(#00fff2), to(white));
  background-image: linear-gradient(#00fff2, white);
}

.service-detail {
  display: -ms-grid;
  display: grid;
  gap: 50px;
  -ms-grid-columns: 1fr 1fr;
      grid-template-columns: 1fr 1fr;
  margin-top: 6%;
  margin-bottom: 50px;
}

.service {
  text-align: center;
  border-radius: 10px;
  background-color: #d5fffd;
}

.service img {
  margin-top: 30px;
  width: 400px;
}

footer {
  color: #fff;
  height: 100px;
  background-color: #000;
  text-align: center;
}

footer p {
  font-size: 1.125rem;
  padding: 30px 0;
}
/*# sourceMappingURL=style.css.map */

Answer 1

単純なミスで、base.htmlの<head>~</head>内のblock名とtop_page.html内のそれとが一致していないだけでした。